The use of pesticides cannot be avoided in agricultural production. However, improper use can cause pesticide damage and even cause crop death. Therefore, the phytotoxicity has a great impact on agricultural production. The following are the vegetables and pesticides that are easy to produce phytotoxicity.
Pesticide phytotoxicity refers to the harmful damage caused to plants by the application of pesticides. The link that causes phytotoxicity is the use of pesticides for spraying, seed dressing, soaking seeds, soil treatment, etc.; the causes of phytotoxicity are excessive concentration of the drug, excessive dosage, improper use or some crops are allergic to the agent; Affect the growth of plants, such as defoliation, falling flowers, fruit drop, yellowing of leaves, leaf stalks, burns, deformities, lengthening and plant death, etc., sometimes reducing the yield or quality of agricultural products. Pesticide phytotoxicity is divided into acute phytotoxicity and chronic phytotoxicity.
(1) Acute phytotoxicity: refers to the symptoms manifested within a few hours to 10 days after application, generally occurring quickly and with obvious symptoms. Most of them are spots, chlorosis, burns, wilting, falling flowers, fruit drop, leaf curl deformity, and tender tissue of young plants.
(2) Chronic phytotoxicity: Symptoms of phytotoxicity will occur within dozens of days after application, and the symptoms are not obvious, mainly affecting the physiological activities of the crop. Such as yellowing, slow growth and development; deformity, small fruit, inferior fruit and so on. In addition, some pesticides have a long residual period in the soil, such as green huanglong, methonone and other herbicides, which easily affect the growth of the squat crop. This is also a manifestation of chronic phytotoxicity.
Mancozeb: It is not suitable for the young fruit of edamame, litchi, grape, high concentration of tobacco and cucurbit crops, easy to produce phytotoxicity
Propiconazole: inhibition of growth seedling period, easy to reduce seedling rate, seedling rigidity
Pentachloronitrobenzene: susceptible to phytotoxicity when contacted with young shoots
Chlorothalonil: high concentration of yam, pear, persimmon, peach, plum
Malignant: Cannot be mixed with strong acid agents
Chunleimycin: slight phytotoxicity to soybeans and alfalfa
Sulfur: not easily used in cucumbers, beans, potatoes, peaches, plums, pears, grapes
Oil emulsion: used in the germination stage and flowering stage, can not be mixed with stone sulfur mixture
Spring Thunder Oxygen Chloride Copper: It is not easy to produce brown spots with the concentration of apple, grape, soybean and alfalfa
Bordeaux mixture: easy to produce phytotoxicity before germination
Stone sulphur mixture: It is easy to cause phytotoxicity to young tissues of grape, peach, pear, plum, plum, apricot and other fruit trees.
2,4 drops of butyl ester: cotton, beans, vegetables, rapeseed and other dicotyledonous plants, large, wheat, rice seedlings should not be used before and after jointing.
Acetylene: seedlings and young shoots are sensitive to the drug under high temperature and high humidity conditions, prone to phytotoxicity
Triazole tin: When the concentration is usually used in the low temperature period, it will have lighter phytotoxicity to the spring shoots, and it will also cause falling flowers, fallen leaves and falling fruits.
Malathion: tomato seedlings, melons, cowpeas, sorghum, cherries, pears and apples
Dimethoate, Omethoate: Concentration of the concentration makes the leaves not close at night
Killing thiophene: cruciferous vegetables and high jealousy
Phoxim: cucumber, green beans, watermelon cucumber, green beans, watermelon
Triazophos: sugar cane, rhubarb, corn bogey
Chlorpyrifos: Chlorpyrifos is very sensitive to tobacco and lettuce, and should not be used for melon seedlings.
Killing phosphorus: flowering, high temperature can not be used
Profenofos: Cruciferous vegetables and walnuts can not be used
Trichlorfon: sorghum, beans, melon seedlings, corn, apples cannot be used
Isoprocarb: potato crops cannot be used
Buprofezin: Drugs such as contact with cabbage, radish and other crops on the leaves will appear brown spots or whitening and other phytotoxicity
Insecticidal double: Cruciferous vegetable seedlings such as beans, cabbage, and cabbage are not used
Flurazine: cabbage and other cruciferous vegetables can not be used in the seedling stage
The above is a contraindication for the use of vegetables, the majority of growers in the purchase of pesticides in addition to the purchase of regular manufacturers of goods, as well as the selection of pesticides suitable for crops, in order to play a role in the prevention and control of pests and diseases.
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